mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
232 lines
9.3 KiB
C++
232 lines
9.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef nsColumnSetFrame_h___
|
|
#define nsColumnSetFrame_h___
|
|
|
|
/* rendering object for css3 multi-column layout */
|
|
|
|
#include "mozilla/Attributes.h"
|
|
#include "nsContainerFrame.h"
|
|
#include "nsIFrameInlines.h" // for methods used by IS_TRUE_OVERFLOW_CONTAINER
|
|
|
|
class nsColumnSetFrame final : public nsContainerFrame {
|
|
public:
|
|
NS_DECL_FRAMEARENA_HELPERS
|
|
|
|
explicit nsColumnSetFrame(nsStyleContext* aContext);
|
|
|
|
virtual void Reflow(nsPresContext* aPresContext,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aStatus) override;
|
|
|
|
#ifdef DEBUG
|
|
virtual void SetInitialChildList(ChildListID aListID,
|
|
nsFrameList& aChildList) override;
|
|
virtual void AppendFrames(ChildListID aListID,
|
|
nsFrameList& aFrameList) override;
|
|
virtual void InsertFrames(ChildListID aListID,
|
|
nsIFrame* aPrevFrame,
|
|
nsFrameList& aFrameList) override;
|
|
virtual void RemoveFrame(ChildListID aListID,
|
|
nsIFrame* aOldFrame) override;
|
|
#endif
|
|
|
|
virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
|
|
virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
|
|
|
|
/**
|
|
* Retrieve the available height for content of this frame. The available content
|
|
* height is the available height for the frame, minus borders and padding.
|
|
*/
|
|
virtual nscoord GetAvailableContentBSize(const nsHTMLReflowState& aReflowState);
|
|
|
|
virtual nsContainerFrame* GetContentInsertionFrame() override {
|
|
nsIFrame* frame = GetFirstPrincipalChild();
|
|
|
|
// if no children return nullptr
|
|
if (!frame)
|
|
return nullptr;
|
|
|
|
return frame->GetContentInsertionFrame();
|
|
}
|
|
|
|
virtual nsresult StealFrame(nsIFrame* aChild, bool aForceNormal) override
|
|
{
|
|
// nsColumnSetFrame keeps true overflow containers in the normal flow
|
|
// child lists (i.e. the principal and overflow lists).
|
|
return nsContainerFrame::StealFrame(aChild,
|
|
IS_TRUE_OVERFLOW_CONTAINER(aChild));
|
|
}
|
|
|
|
virtual bool IsFrameOfType(uint32_t aFlags) const override
|
|
{
|
|
return nsContainerFrame::IsFrameOfType(aFlags &
|
|
~(nsIFrame::eCanContainOverflowContainers));
|
|
}
|
|
|
|
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsRect& aDirtyRect,
|
|
const nsDisplayListSet& aLists) override;
|
|
|
|
virtual nsIAtom* GetType() const override;
|
|
|
|
virtual void PaintColumnRule(nsRenderingContext* aCtx,
|
|
const nsRect& aDirtyRect,
|
|
const nsPoint& aPt);
|
|
|
|
/**
|
|
* Similar to nsBlockFrame::DrainOverflowLines. Locate any columns not
|
|
* handled by our prev-in-flow, and any columns sitting on our own
|
|
* overflow list, and put them in our primary child list for reflowing.
|
|
*/
|
|
void DrainOverflowColumns();
|
|
|
|
#ifdef DEBUG_FRAME_DUMP
|
|
virtual nsresult GetFrameName(nsAString& aResult) const override {
|
|
return MakeFrameName(NS_LITERAL_STRING("ColumnSet"), aResult);
|
|
}
|
|
#endif
|
|
|
|
protected:
|
|
nscoord mLastBalanceBSize;
|
|
nsReflowStatus mLastFrameStatus;
|
|
|
|
/**
|
|
* These are the parameters that control the layout of columns.
|
|
*/
|
|
struct ReflowConfig {
|
|
// The number of columns that we want to balance across. If we're not
|
|
// balancing, this will be set to INT32_MAX.
|
|
int32_t mBalanceColCount;
|
|
|
|
// The inline-size of each individual column.
|
|
nscoord mColISize;
|
|
|
|
// The amount of inline-size that is expected to be left over after all the
|
|
// columns and column gaps are laid out.
|
|
nscoord mExpectedISizeLeftOver;
|
|
|
|
// The width (inline-size) of each column gap.
|
|
nscoord mColGap;
|
|
|
|
// The maximum bSize of any individual column during a reflow iteration.
|
|
// This parameter is set during each iteration of the binary search for
|
|
// the best column block-size.
|
|
nscoord mColMaxBSize;
|
|
|
|
// A boolean controlling whether or not we are balancing. This should be
|
|
// equivalent to mBalanceColCount == INT32_MAX.
|
|
bool mIsBalancing;
|
|
|
|
// The last known column block-size that was 'feasible'. A column bSize is
|
|
// feasible if all child content fits within the specified bSize.
|
|
nscoord mKnownFeasibleBSize;
|
|
|
|
// The last known block-size that was 'infeasible'. A column bSize is
|
|
// infeasible if not all child content fits within the specified bSize.
|
|
nscoord mKnownInfeasibleBSize;
|
|
|
|
// block-size of the column set frame
|
|
nscoord mComputedBSize;
|
|
|
|
// The block-size "consumed" by previous-in-flows.
|
|
// The computed block-size should be equal to the block-size of the element
|
|
// (i.e. the computed block-size itself) plus the consumed block-size.
|
|
nscoord mConsumedBSize;
|
|
};
|
|
|
|
/**
|
|
* Some data that is better calculated during reflow
|
|
*/
|
|
struct ColumnBalanceData {
|
|
// The maximum "content block-size" of any column
|
|
nscoord mMaxBSize;
|
|
// The sum of the "content block-size" for all columns
|
|
nscoord mSumBSize;
|
|
// The "content block-size" of the last column
|
|
nscoord mLastBSize;
|
|
// The maximum "content block-size" of all columns that overflowed
|
|
// their available block-size
|
|
nscoord mMaxOverflowingBSize;
|
|
// This flag determines whether the last reflow of children exceeded the
|
|
// computed block-size of the column set frame. If so, we set the bSize to
|
|
// this maximum allowable bSize, and continue reflow without balancing.
|
|
bool mHasExcessBSize;
|
|
|
|
void Reset() {
|
|
mMaxBSize = mSumBSize = mLastBSize = mMaxOverflowingBSize = 0;
|
|
mHasExcessBSize = false;
|
|
}
|
|
};
|
|
|
|
bool ReflowColumns(nsHTMLReflowMetrics& aDesiredSize,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aReflowStatus,
|
|
ReflowConfig& aConfig,
|
|
bool aLastColumnUnbounded,
|
|
nsCollapsingMargin* aCarriedOutBEndMargin,
|
|
ColumnBalanceData& aColData);
|
|
|
|
/**
|
|
* The basic reflow strategy is to call this function repeatedly to
|
|
* obtain specific parameters that determine the layout of the
|
|
* columns. This function will compute those parameters from the CSS
|
|
* style. This function will also be responsible for implementing
|
|
* the state machine that controls column balancing.
|
|
*/
|
|
ReflowConfig ChooseColumnStrategy(const nsHTMLReflowState& aReflowState,
|
|
bool aForceAuto, nscoord aFeasibleBSize,
|
|
nscoord aInfeasibleBSize);
|
|
|
|
/**
|
|
* Perform the binary search for the best balance height for this column set.
|
|
*
|
|
* @param aReflowState The input parameters for the current reflow iteration.
|
|
* @param aPresContext The presentation context in which the current reflow
|
|
* iteration is occurring.
|
|
* @param aConfig The ReflowConfig object associated with this column set
|
|
* frame, generated by ChooseColumnStrategy().
|
|
* @param aColData A data structure used to keep track of data needed between
|
|
* successive iterations of the balancing process.
|
|
* @param aDesiredSize The final output size of the column set frame (output
|
|
* of reflow procedure).
|
|
* @param aOutMargin The bottom margin of the column set frame that may be
|
|
* carried out from reflow (and thus collapsed).
|
|
* @param aUnboundedLastColumn A boolean value indicating that the last column
|
|
* can be of any height. Used during the first iteration of the
|
|
* balancing procedure to measure the height of all content in
|
|
* descendant frames of the column set.
|
|
* @param aRunWasFeasible An input/output parameter indicating whether or not
|
|
* the last iteration of the balancing loop was a feasible height to
|
|
* fit all content from descendant frames.
|
|
* @param aStatus A final reflow status of the column set frame, passed in as
|
|
* an output parameter.
|
|
*/
|
|
void FindBestBalanceBSize(const nsHTMLReflowState& aReflowState,
|
|
nsPresContext* aPresContext,
|
|
ReflowConfig& aConfig,
|
|
ColumnBalanceData& aColData,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
nsCollapsingMargin& aOutMargin,
|
|
bool& aUnboundedLastColumn,
|
|
bool& aRunWasFeasible,
|
|
nsReflowStatus& aStatus);
|
|
/**
|
|
* Reflow column children. Returns true iff the content that was reflowed
|
|
* fit into the mColMaxBSize.
|
|
*/
|
|
bool ReflowChildren(nsHTMLReflowMetrics& aDesiredSize,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aStatus,
|
|
const ReflowConfig& aConfig,
|
|
bool aLastColumnUnbounded,
|
|
nsCollapsingMargin* aCarriedOutBEndMargin,
|
|
ColumnBalanceData& aColData);
|
|
};
|
|
|
|
#endif // nsColumnSetFrame_h___
|